The balanced current control of dual-redundancy permanent magnetic brushless DC motor

The main purpose of this paper is the method study of balanced current control of dual-redundancy permanent magnetic brushless DC motor (BLDCM), which is used in the electromechanical actuator system of aircraft. The cause and consequence of unbalanced current in the winding of dual-redundancy motor under simultaneous operation station are deeply analyzed. The dynamic mathematic model of dual-redundancy BLDCM is built, in which the mutual induction between every phases in dual-redundancy windings are considered. The balanced control of current is realized by using the method of crossed-compare each other of dual-redundancy current. The implementation of the basic control circuits of the balanced current is introduced. The simulation results and the experimental data of system show the validity of this method. It can realize the balanced current in windings of the brushless DC motor, and can also control the dual-redundancy motor to output equal torque at the same time.